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In the present work, an effort has been made to propose and implement a new steganographic technique for images by modifying existing algorithms. This technique uses LSB steganography as the basis and randomly disperses the secret message over the entire image to ensure that the secret message cannot be obtained easily from the image. Detailed visual and statistical analysis of the algorithm reveals...
Many location-based services for alerting persons of nearby friends have been deployed in practice. A drawback of most approaches to providing such services is that friends always learn each other's location even when they are not actually nearby. The Louis protocol proposed by Zhong, Goldberg and Hengartner aims to ensure that a friend's location is revealed to another friend if and only if the friends...
Peer-to-peer (P2P) networks are vulnerable to Distributed Denial-of-Service (DDoS) attacks, which cause invalid packets to be flooded through the P2P network, preventing valid packets from being delivered. This causes a disruption of the services provided by the P2P network. Since, anonymity and lack of centralized control/censorship are the salient features of P2P networks; it often encourages malicious...
This paper addresses the problem of secure path key establishment in wireless sensor networks that uses the random key pre-distribution technique. Inspired by the recent proxy-based scheme in the work of Ling and Znati (2005) and Li et al. (2005), we introduce a friend-based scheme for establishing pairwise keys securely. We show that the chances of finding friends in a neighbourhood are considerably...
In many applications of sensor networks, security is a very important issue. To be resistant against the various attacks, nodes in a sensor network can establish pairwise secret keys, authenticate all communications with cryptographic functions, and also apply secure information aggregation schemes or hop-by-hop filtering methods. However, these security measures can take considerable overhead in...
A key function for network traffic monitoring and analysis is the ability to perform aggregate queries over multiple data streams. Change detection is an important primitive which can be extended to construct many aggregate queries. The recently proposed sketches (Krishnamurthy, 2003) are among the very few that can detect heavy changes online for high speed links, and thus support various aggregate...
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